[3053] Fixed memory leak with enabled dynamicConfigReload.

[dimasch]

Related issues

closes #3053

Screenshots of visual changes before/after (if there are any)

After stress test GC corrected flush memory usage:

Which environment this relates to

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing VS sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and currently important rules acceptance

• I read and followed contribution rules
• I read the TypeScript Action Plan and adjusted my PR according to it
• I read about Vue Storefront Modules and I am aware that every new feature should be a module

[pkarw]

Thanks @dimasch however there is a problem with eslint causing CI to fail:

/home/travis/build/DivanteLtd/vue-storefront/core/scripts/server.js
  252:7  error  Variables should not be deleted  no-delete-var

Please fix it - even by adding the ignore

[pkarw]

Please do fix the CI bugs + add a changelog

[patzick]

Nice catch, but variables should not be deleted - http://linterrors.com/js/only-properties-should-be-deleted

Please also update changelog :)

[pkarw]

@dimasch you missed the changelog update - please add a line on this fix there and we're merging this in :)

[pkarw]

Thanks!